Android应用中执行Linux命令

/** 执行Linux命令，并返回执行结果。 */  
      public static String exec(String[] args) {  
          String result = "";  
          ProcessBuilder processBuilder = new ProcessBuilder(args);  
          Process process = null;  
          InputStream errIs = null;  
          InputStream inIs = null;  
          try {  
              ByteArrayOutputStream baos = new ByteArrayOutputStream();  
              int read = -1;  
              process = processBuilder.start();  
              errIs = process.getErrorStream();  
              while ((read = errIs.read()) != -1) {  
                  baos.write(read);  
              }  
              baos.write('\n');  
              inIs = process.getInputStream();  
              while ((read = inIs.read()) != -1) {  
                  baos.write(read);  
              }  
              byte[] data = baos.toByteArray();  
              result = new String(data);  
          } catch (IOException e) {  
              e.printStackTrace();  
          } catch (Exception e) {  
              e.printStackTrace();  
          } finally {  
              try {  
                  if (errIs != null) {  
                      errIs.close();  
                  }  
                  if (inIs != null) {  
                      inIs.close();  
                  }  
              } catch (IOException e) {  
                  e.printStackTrace();  
              }  
              if (process != null) {  
                  process.destroy();  
              }  
          }  
          return result;  
      }  

String[] args = { "chmod", "777", "(文件路径)"};  
 exec(args);